Update nightly.yml

.github/workflows/nightly.yml

@@ -103,7 +103,12 @@ jobs:
       
       - name: Install B2 CLI
         shell: bash
-        run: sudo pip install --upgrade b2
+        run: |
+          python -m pip install --upgrade pip
+          sudo pip install --upgrade b2
+      
+      - name: Display Python version
+        run: python -c "import sys; print(sys.version)"
       
       - name: Download Windows artifacts
         uses: actions/download-artifact@v1